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Further Workplace Health and Safety bosses will be grilled at the inquest into the Dreamworld disaster today, after a leading inspector admitted he had "no confidence" in the emergency procedures in place on the Thunder River Rapids ride.

Darling Range by-election: Labor loss 'sends a clear message'

The West Australian Liberals are basking in the glow of a strong by-election win, saying a big swing away from Labor in the state seat of Darling Range "sends a clear message".

Alyssa Hayden, a two-term Barnett government upper house MP, beat Labor candidate Tania Lawrence, a former Woodside manager who was parachuted in after the government's first candidate Colleen Yates quit in a storm of controversy.

Ms Yates bowed out of the race days after being endorsed when it emerged she'd exaggerated her tertiary qualifications in an online profile.

It was a staggering development given the by-election was triggered by the resignation of Barry Urban after lies about his background - including wearing a police medal he wrongly claimed was for investigating war crimes in Bosnia - were uncovered.

Premier Mark McGowan blamed the loss on the two controversies, saying they had clearly hit Labor in the polling booths, although he didn't name names and added it was always hard to win a by-election in government.

"It was a very tough by-election and very tough circumstances as we are all aware," Mr McGowan told party members yesterday.

The Liberal campaign also highlighted big hikes in household fees and charges, which kick in on July 1, labelling them broken election promises.